merge
Merge commit '2db89a986b902dad2bdeb1c98fa36d5e29cdf047' into develop
add stage3 into build script
modify title menu
bug fix
stage4 50%
Merge branch 'Stage3' into develop
star item speed down
marshal sound copyright, and add stage3 bgm.

fix
support lefty

support lefty
setting
tunng
Merge remote-tracking branch 'minimo/Stage3' into develop

Conflicts:
	src/GlShooter2.js
remerge
bug fix
new bullet texture
add enemy image
new texture
modify texture tool
add maimai effect